How to connect multiple databases through thinkphp

thinkphp connects to multiple databases
In the configuration file:

return array(    //数据库配置信息 默认连接这一个
    'DB_TYPE' => 'mysql', // 数据库类型
    'DB_HOST' => '127.0.0.1', // 服务器地址
    'DB_NAME' => 'test1', // 数据库名
    'DB_USER' => 'root', // 用户名
    'DB_PWD' => '', // 密码
    'DB_PORT' => 3306, // 端口
    'DB_PREFIX' => '', // 数据库表前缀
    'DB_CHARSET'=> 'utf8', // 字符集
    'LOAD_EXT_FILE'=>'functions',    //我的第一个数据库连接
    'DB_BBS'=>array(    'dbms' => 'mysql',    'username' => 'root',    'password' => '',    'hostname' => '127.0.0.1',    'hostport' => '3306',    'database' => 'test1'
    ),    //第二个数据库链接,
    'DB_NEWS'=>array(    'dbms'=>'mysql',    'username'=>'root',    'password'=>'',    'hostname'=>'127.0.0.1',    'hostport'=>'3306',    'database'=>'test2'
    )
);

Operations to interact with the database:
When instantiating the table
The dot in front is the database name, and the dot is the table Name

$user=M('test2.user');

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